BDP5200/12 can't connect to WiFi

Hi all,
few days ago I bought the BDP5200 player: it works, it is great but it gives me a little problem, it won't connect on my wi-fi. I explain better: I have a router ZyXEL P-660HW-D1 and with it I manage via ethernet my pc and via wi-fi my notebook, 2 iphones and 2 ipads. I use a protected wi-fi (wpa-psk) and when i put the password on BDP I see a screen that says to me that it is impossible to connect to the router. So I tried to cancel the password from the router (no more protected) and I tried to connect the BDP: GREAT it works!!! I was able also to put in all the information of my net (gateway, subnet mask etc. etc.). And it works very fine, I saw also the net tv and the movies on my shared hard disk. The problem is: i cannot continue to have an unprotected wi-fi; what can I do? Why the BDP does not communicate with a protected wi-fi? (and yes, the password I put in was correct ;-)).
Thanx in advance to all want help me
Alex

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